During today's compulsive browsing for somebody on craigslist selling something for 1/10 of what it's worth, I came across an ad for this Visacrem lever machine.

I'm not about to spend (even if I had it) the $5k the seller's asking, but I find myself wondering, "What the heck is that big glass thing on the right of the machine?" So, I figured I'd post the photo here and ask, what the heck is that big glass thing on the right of the machine?

Thanks for your deep and abiding knowledge of such espresso esoterica.

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